Tapping ur feet is the best BPM counter!
I agree w/ Angelic, BPM counters are not accurate to the point of total reliability. IMO it's usefull to one figure out the ballparks and still only in very specific occasions, like less-than-perfect clubs and gigs enviroments, BUT a dj should know his tunes well enough to figure that out too, at least IMO.
Pio has the most precise and reliable BPM counters, but even when using the BPM synced effects on
my djm 600 I still tap the tempo into it instead of just rely on the auto bpm.
And IMO BPM X good mixing has nothing to do, as BPM only means the tempo of the 2 tracks is the same but still the dj must drop in and adjust this sync and all the other processes that involve mixing. That's the Achiles' tendon of the Automix on the CMX 5K, it can match the tempos pretty good (even better than some jocks!

) but can't figure out the exact point to cue and enter the new track... = bad mixing in more than 80% of the times.
TIP
P.S. A good tip to minimize the risk of getting caugh in a trap like not having good equipment or bad monitoring situations is to write down the BPM of ur tracks in the label of the tunes, so u sort of know in advance which ones go with others, and also if one track is pitched up or down u can somewhat predict the need for pitching up or down the following track. That makes for flash syncro of tunes in any place!
[Edited by Alex TC on 01-06-2001 at 11:36 AM]